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Updated: Jul 3, 2026

Intradermal Inoculation of Mycobacterium avium in the Mouse Ear
Published on: July 3, 2025
Treatment and developmental therapeutics of Mycobacterium avium complex (MAC) infections
1National Institute of Allergy and Infectious Diseases, NIH, Solar Building, Room 4C-04, Bethesda, MD 20892, USA.
Abstract:
Opportunistic infections associated with AIDS pose very serious problems because of their exceedingly high morbidity and mortality. For their part, Mycobacterium avium and M. intracellulare, two organisms belonging to M. avium complex (MAC), are the most often isolated bacteria from AIDS patients. Although in recent years, some progress has been made, by and large, there is no viable drug and /or combinations of drugs effective against MAC, especially in AIDS patients. Conventional therapies with multiple drug combinations involving isoniazid, rifampin, ethambutol, streptomycin, ethionamide, and cycloserine are still widely used, as well as prophylactic treatment with rifabutin. The use of clofazimine and ciprofloxacin has also been reported. Studies on new quinolones (sparfloxacin, difloxacin, WIN 57273), macrolides, folate antagonists and antimcobacterial anitbiotics are being actively pursued along with novel strategies involving drugs inhibiting mycobacterial cell wall biosynthesis. The role of various cytokines in enhancing host immune defenses against MAC infections is also discussed.
Insights
Mycobacterium avium complex (MAC) infections are a major threat for AIDS patients, with limited effective treatments. Research is exploring novel drugs and immune strategies to combat these opportunistic infections.
Area of Science:
- Infectious Diseases
- Immunology
- Pharmacology
Background:
- Opportunistic infections, particularly Mycobacterium avium complex (MAC), present significant morbidity and mortality challenges in Acquired Immunodeficiency Syndrome (AIDS) patients.
- MAC infections are the most common bacterial isolates in individuals with AIDS, highlighting a critical unmet medical need.
- Current therapeutic options for MAC infections in AIDS patients remain limited, with no universally effective drugs or drug combinations available.
Purpose of the Study:
- To review the current landscape of Mycobacterium avium complex (MAC) infections in AIDS patients.
- To discuss the limitations of conventional and existing therapies for MAC infections.
- To explore emerging therapeutic strategies and research directions for treating MAC infections in the context of AIDS.
Main Methods:
- Review of existing literature on MAC infections in AIDS.
- Analysis of conventional and reported drug treatments for MAC.
- Examination of ongoing research into novel antimicrobial agents and host-directed therapies.
Main Results:
- Conventional multi-drug regimens and prophylactic treatments like rifabutin are widely used but often insufficient.
- Emerging research focuses on new quinolones, macrolides, folate antagonists, and antimycobacterial antibiotics.
- Novel strategies targeting mycobacterial cell wall biosynthesis and the role of cytokines in immune defense are under investigation.
Conclusions:
- Effective treatment for MAC infections in AIDS patients remains a significant challenge.
- Active research into novel antimicrobial drugs and immunomodulatory approaches offers promise for future therapies.
- A combination of pharmacological and immunological strategies may be necessary to effectively manage MAC infections in this vulnerable population.
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